Conveying device for cruiser frame production line

Abstract

The invention relates to the technical field of vehicle frame production lines, in particular to a conveying device for a patrol vehicle frame production line, and solves the problem that operation is troublesome when frames of small vehicles such as patrol vehicles are conveyed. The device comprises a positioning mechanism used for positioning a frame, the positioning mechanism comprises a connecting block connected with a conveying mechanism and a supporting plate, the conveying mechanism drives the supporting plate to move through the connecting block, rotating rods in the vertical direction are rotationally arranged on the two sides of the connecting block, and the two rotating rods are symmetrically arranged and synchronously rotate; the top of the rotating rod penetrates through the supporting plate and is provided with an ejector rod, a gear is arranged at the bottom of the rotating rod, a first rack and a second rack matched with the gear are arranged on the conveying mechanism in the conveying direction, and the first rack and the second rack are opposite in direction and located on the two sides of the gear respectively in the conveying direction. According to the invention, the operation is simple, and the frame does not need to be fixed specially.

Description

Technical Field

[0001] The invention relates to the technical field of vehicle frame production lines, and in particular to a conveying device for a patrol vehicle frame production line. Background Art

[0002] The frame production line is an assembly line that completes various operations and processing during the production process of the frame. It mainly includes a conveying mechanism and a processing device. The frame is conveyed through the conveying mechanism and completes various processing steps in turn through various robots. However, for some small vehicles such as patrol cars, in order to reduce production costs and because the weight of such frames is generally light, manufacturers still use manual cooperation with conveying devices for operation and processing. That is, the frame is manually placed on the conveying mechanism, the frame moves with the conveying mechanism, and then manually processed. After the processing is completed, the frame is manually removed.

[0003] In order to facilitate the processing of the frame, the frame needs to be fixed when it is placed on the conveying mechanism. Generally, a certain fixing mechanism is set on the conveying mechanism to achieve this. After the processing is completed, the fixing mechanism is released and the frame is removed, which is a more troublesome operation.

[0004] Therefore, the present invention provides a conveying device for a patrol car frame production line to solve the above-mentioned problems. Summary of the invention

[0005] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a conveying device for a patrol car frame production line to solve the above-mentioned problem that the operation is relatively troublesome when conveying the frames of some small vehicles such as patrol cars.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A conveying device for a patrol car frame production line, comprising a conveying mechanism and a supporting mechanism located on the conveying mechanism, wherein the supporting mechanism moves with the conveying mechanism, and the supporting mechanism comprises a supporting plate and a plurality of first universal balls located on the supporting plate;

[0008] The invention also includes a positioning mechanism for positioning the frame, the positioning mechanism includes connecting blocks respectively connected to the transmission mechanism and the support plate, the transmission mechanism drives the support plate to move through the connecting blocks, rotating rods along the vertical direction are rotatably arranged on both sides of the connecting blocks, the two rotating rods are symmetrically arranged and rotate synchronously, the top of the rotating rod passes through the support plate and is provided with a top rod, and the bottom of the rotating rod is provided with a gear, the transmission mechanism is provided with a first rack and a second rack adapted to the gear along the transmission direction, the first rack and the second rack are along the transmission direction, and the first rack and the second rack are in opposite directions, and are respectively located on both sides of the gear,

[0009] During operation, the frame is placed on the support plate. When the connecting block drives the support plate to move along the transmission direction, it drives the two gears to move forward and reverse successively, and then drives the rotating rod and the push rod to move forward and reverse successively. The frame is first positioned and fixed by the two push rods, and then reset.

[0010] Preferably, connecting plates are respectively provided on both sides of the connecting block, and a rotating rod is rotatably arranged through the connecting plates. The bottom of the rotating rod passes through the connecting plates and is rotatably connected to the connecting plates, and a first elastic limiting sleeve is provided between the connecting plates.

[0011] Preferably, the conveying mechanism comprises a frame and a magnetic coupling rodless cylinder arranged on the frame, and the connecting block is respectively connected to a slider and a support plate of the magnetic coupling rodless cylinder.

[0012] Preferably, two groups of the first rack and the second rack are provided, and each gear is matched with a first rack and a second rack respectively.

[0013] Preferably, a second universal ball is provided at the end of the push rod.

[0014] Preferably, the rotating rod comprises a first rod body and a second rod body arranged above and below, the top rod is arranged on the first rod body, a threaded sleeve is arranged in the vertical direction at the top of the first rod body, the second rod body and the connecting block are arranged to rotate relative to each other, a threaded rod adapted to the threaded sleeve is arranged at the top of the second rod body and is threadedly connected to the threaded sleeve through the threaded rod, and a second elastic limiting sleeve is arranged between the second rod body and the first rod body;

[0015] A limiting baffle for limiting the position of the push rod is provided on the support plate between the two rotating rods (404).

[0016] Preferably, the second elastic limiting sleeve is connected to the first rod body via a limiting spring.

[0017] Preferably, the push rod is detachably connected to the first rod body, a slot is provided on the second rod body, and a retaining ring is provided on the periphery of the second rod body.

[0018] Preferably, a fixing mechanism is also included, which includes two third racks, which are arranged on the support plate along the conveying direction and slide along the conveying direction. A third universal ball is provided at one end of the third rack, and the two third racks are respectively meshed and connected with a gear.

[0019] Preferably, the support plate is provided with a slide groove along the conveying direction, a slide plate is slidably provided in the slide groove, and the third rack is arranged on the slide plate.

[0020] The beneficial effects of the present invention are:

[0021] 1. When the present invention is used in practice, it is only necessary to place the frame on the support plate. When the support plate moves, the gear is meshed with the first rack and the second rack in turn, thereby performing forward and reverse rotations in turn. When rotating forward, the push rod is driven to approach the side beams on both sides of the frame, and the frame is pushed by the push rod to move on the support plate through the first universal ball, and finally the distance between the ends of the two push rods is equal to the distance between the corresponding two side beams, so that automatic fixing is achieved. After fixing, the frame can be processed. After the processing is completed, as the support plate continues to move, when the gear is reversed, the two push rods are not close to the side beams on both sides, so that the distance between the ends of the two push rods is smaller than the distance between the corresponding two side beams, so that the two rotating rods are automatically reset, thereby facilitating the removal of the frame. The present invention is simple to operate and does not require special fixing operations on the frame.

[0022] 2. When placing the frame, the present invention has a lower requirement on the placement position of the frame. After being fixed by the rotating rod, the position of the frame on the support plate can be automatically adjusted appropriately.

[0023] 3. In the present invention, by arranging a universal ball on the support plate, the friction force on the bottom of the frame can be reduced, which helps the frame to move smoothly on the support mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 It is a schematic diagram of the overall structure of the positioning mechanism in the present invention;

[0026] Figure 3 It is a schematic diagram of the positions of the second universal ball, the first elastic limiting sleeve and the gear in the present invention;

[0027] Figure 4 It is a schematic diagram of the specific structure of the rotating rod in the present invention;

[0028] Figure 5 is a schematic diagram of the specific structure of the frame;

[0029] Figure 6 It is a schematic diagram of the present invention when the frame is placed in the initial state;

[0030] Figure 7 It is a schematic diagram of the present invention when driving the frame to move;

[0031] Figure 8 It is a schematic diagram of the overall structure of the fixing mechanism in the present invention;

[0032] Fig. 9 It is a specific schematic diagram of the fixing mechanism in the present invention.

[0033] In the figure: 1. transmission mechanism, 101. frame, 102. magnetic rodless cylinder, 2. support mechanism, 201. support plate, 202. first universal ball, 3. limit baffle, 4. positioning mechanism, 401. connecting block, 402. push rod, 403. connecting plate, 404. rotating rod, 4041. first rod body, 4042. threaded sleeve, 4043. threaded rod, 4044. limit spring, 4045. second elastic limit sleeve, 4046. retaining ring, 4047. second rod body, 405. first rack, 406. second rack, 407. second universal ball, 408. first elastic limit sleeve, 409. gear, 5. frame, 6. fixing mechanism, 601. slide plate, 602. slide groove, 603. third rack. DETAILED DESCRIPTION

[0034] The following will refer to the attached Figures 1 to 9 The embodiments of the present invention are described in detail. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0035] Example 1

[0036] A conveyor for a patrol car frame production line, as shown in the attached Figure 1 , Figure 5 As shown, it includes a conveying mechanism 1 and a supporting mechanism 2 located on the conveying mechanism 1. The supporting mechanism 2 is used to place a frame 5 and moves with the conveying mechanism 1 to achieve conveyance. The supporting mechanism 2 includes a supporting plate 201 and a plurality of first universal balls 202 located on the supporting plate 201. By setting the first universal balls 202, the friction force on the bottom of the frame 5 when placed on the supporting mechanism 2 is reduced, thereby facilitating the movement of the frame 5 on the supporting mechanism 2.

[0037] As attached Figure 2 , Figure 3 , Figure 6 , Figure 7As shown, it also includes a positioning mechanism 4 for positioning the frame 5, the positioning mechanism 4 includes a connecting block 401 connected to the transmission mechanism 1 and the support plate 201 respectively, the transmission mechanism 1 drives the support plate 201 to move through the connecting block 401, and rotating rods 404 along the vertical direction are rotatable on both sides of the connecting block 401, and the two rotating rods 404 are symmetrically arranged and rotate synchronously. In this embodiment, the transmission mechanism 1 transmits in the left and right directions, and the front and rear sides of the connecting block 401 rotate and symmetrically set the rotating rods 404 along the vertical direction. The top of the rotating rod 404 passes through the support plate 201 and is provided with a top rod 402. Specifically, corresponding through holes are opened at corresponding positions of the support plate 201, and a gear 409 is provided at the bottom of the rotating rod 404. A first rack 405 and a second rack 406 adapted to the gear 409 are provided on the transmission mechanism 1 along the left and right directions. The first rack 405 and the second rack 406 are along the left and right directions, and the first rack 40 5 and the second rack 406 are in opposite directions and are respectively located at the front and rear sides of the gear 409. It should be noted that the first rack 405 and the second rack 406 can be set in two groups or one group. When one group is set, a certain transmission mechanism needs to be set between the two rotating rods 404 to make the two rotating rods 404 move synchronously. In this embodiment, two groups of first racks 405 and second racks 406 are set, and each gear 409 is respectively adapted to a first rack 405 and a second rack 406. Specifically, the first rack 405 and the second rack 406 adapted to the front side gear 409 are arranged from left to right and along the left and right direction, wherein the teeth of the first rack 405 face the rear side, and the teeth of the second rack 406 face the front side. The first rack 405 and the second rack 406 adapted to the rear side gear 409 are arranged from left to right and along the left and right direction, wherein the teeth of the first rack 405 face the front side, and the teeth of the second rack 406 face the rear side.

[0038] Working principle: during operation, the frame 5 is placed on the support plate 201. Specifically, the frame 5 includes two longitudinal beams 502 and several cross beams 501 between the longitudinal beams 502. When the connecting block 401 drives the support plate 201 to move along the transmission direction, it drives the two gears 409 to move forward and reverse successively, and then drives the rotating rod 404 and the push rod 402 to move forward and reverse successively in turn. The frame 5 is first positioned and fixed by the two push rods 402, and then reset. Specifically, during forward rotation, the front gear 409 rotates clockwise, and the rear gear 409 rotates counterclockwise, driving the two push rods 402 to push the longitudinal beam 502 to achieve positioning of the frame 5. After positioning, the frame 5 can be processed. During reverse rotation, the front gear 409 rotates counterclockwise, and the rear gear 409 rotates clockwise. The two push rods 402 no longer push the longitudinal beam 502, and the frame 5 is no longer positioned, so the frame 5 can be removed.

[0039] In addition, it should be noted that, in the present embodiment, the lengths of the first rack 405 and the second rack 406 need to be adapted to the specifications of the specific frame 5, that is, when the gear 409 has moved along the first rack 405, the distance between the ends of the two push rods 402 is equivalent to the distance between the two longitudinal beams 502 of the frame 5, and the top fixation is just completed. In order to prevent self-rotation, the second rack 406 and the first rack 405 need to be arranged uninterruptedly, that is, after the gear 409 has just moved along the first rack 405, it moves along the second rack 406. After completing the top fixation, processing, and removing the frame 5, the support mechanism 2 can be reset to the initial position.

[0040] The present invention is easy to operate and does not require special fixing operation for the frame 5; when placing the frame 5, the requirements for the placement position of the frame 5 are relatively low. After being fixed by the rotating rod 15, the position of the frame 5 on the support plate 201 can be automatically adjusted appropriately; by arranging a universal ball on the support plate 201, the friction force on the bottom of the frame 5 can be reduced, which helps the frame 5 to move smoothly on the support mechanism 2.

[0041] Example 2

[0042] As attached Figure 1 As shown, different from Example 1, the conveying mechanism 1 in this embodiment includes a frame 101 and a magnetic rodless cylinder 102 arranged on the frame 101, and the magnetic rodless cylinder 102 is along the left and right directions, and the connecting block 401 is respectively connected to the slider and the support plate 201 of the magnetic rodless cylinder 102, so that the reciprocating motion of the support mechanism 2 can be easily controlled through the magnetic rodless cylinder 102.

[0043] Example 3

[0044] As attached Figure 1 , Figure 2 , Figure 3 , Figure 5 As shown, different from Example 1, in this embodiment, connecting plates 403 are respectively provided on the front and rear sides of the connecting block 401, and a rotating rod 404 is rotatably set through the connecting plate 403. The bottom of the rotating rod 404 passes through the connecting plate 403 and is rotatably connected to the connecting plate 403, and a first elastic limiting sleeve 408 is provided between the connecting plate 403, and the specific first elastic limiting sleeve 408 can be made of rubber.

[0045] In this embodiment, a first elastic limiting sleeve 408 is provided to limit the rotation of the rotating rod 404. When the gear 409 is not subjected to external force, the rotating rod 404 is prevented from rotating. When the first rack 405 and the second rack 406 are specifically provided, the first rack 405 and the second rack 406 can be spaced a certain distance apart, that is, when the support mechanism 2 performs a transmission movement, the gear 409 moves and rotates along the first rack 405, and can maintain the current state and continue to move for a distance. The end distance can be set according to actual needs. During the transmission process, the top rod 402 can maintain the top fixation on the frame 5, and the frame 5 can be processed within this distance. When the gear 409 moves to the second rack 406, the gear 409 rotates and resets along the second rack 406.

[0046] In addition, in this embodiment, the conveying mechanism 1 can also be a closed-loop type, that is, the supporting mechanism 2 performs a closed-loop motion along the conveying mechanism 1, and when it disengages from the first rack 405 and the second rack 406, it can maintain the angle of the top rod 402, so that when the supporting mechanism 2 moves to the initial position, the state of the top rod 402 is consistent with the initial state; under this structure, multiple supporting mechanisms 2 and positioning mechanisms 4 can also be set on the conveying mechanism 1 to facilitate production and processing needs.

[0047] In addition, it should be noted that, in this embodiment, the lengths of the first rack 405 and the second rack 406 still need to be adapted to the specifications of the specific frame 5 .

[0048] Example 4

[0049] As attached Figure 1 , Figure 2 , Figure 3 , Figure 7 As shown, different from Example 1, in this embodiment, a second universal ball 407 is provided at the end of the push rod 402, and the push rod 402 contacts the frame 5 through the second universal ball 407. The surface of the second universal ball 407 is smooth, and when it first contacts the frame 5, the impact on the frame 5 can be reduced, thereby protecting the frame 5 to a certain extent.

[0050] As attached Figure 2 , Figure 3 , Figure 4As shown, in this embodiment, the rotating rod 404 includes a first rod body 4041 and a second rod body 4047 arranged up and down, the top rod 402 is arranged on the first rod body 4041, and the top of the first rod body 4041 is provided with a threaded sleeve 4042 along the vertical direction, the second rod body 4047 is arranged to rotate relative to the connecting block 401, and the top of the second rod body 4047 is provided with a threaded rod 4043 adapted to the threaded sleeve 4042 and is threadedly connected to the threaded sleeve 4042 through the threaded rod 4043, and a second elastic limiting sleeve 4045 is provided between the second rod body 4047 and the first rod body 4041. Specifically, the second elastic limiting sleeve 4045 can be made of rubber, and is provided with a plurality of them, which are connected to the first rod body 4041 through a limiting spring 4044; a limiting baffle 3 for limiting the top rod 402 is provided between the two rotating rods 404 on the support plate 201.

[0051] Working principle: During operation, the initial position of the push rod 402 in this embodiment is in contact with the limit baffle 3. When the support mechanism 2 moves along the first rack 405 in the transmission direction, initially under the action of the second elastic limit sleeve 4045, the first rod body 4041 and the second rod body 4047 do not move relative to each other, that is, the gear 409 drives the first rod body 4041 and the second rod body 4047 to rotate together, until the ends of the two push rods 402 are respectively in contact with the frame 5 through the corresponding second universal balls 407. After the top fixation is achieved, the gear 409 can continue to move along the first rack 405. In this process, since the push rod 402 cannot continue to rotate, the first rod body 4041 and the second rod body 4047 will overcome the second elastic limit sleeve 4045 and rotate relative to each other, causing the first rod body 4041 to be displaced in the vertical direction. In this embodiment, the first rod body 4041 moves upward, driving the push rod 402 to rise, and the push rod 402 can rise smoothly through the second universal ball 407; when the support mechanism 2 moves along the second rack 406 along the transmission direction, the gear 409 reverses, and under the action of the second elastic limiting sleeve 4045, the first rod body 4041 and the second rod body 4047 do not move relative to each other, directly driving the push rod 402 to reverse, and no longer fixing the frame 5 until the push rod 402 contacts the limit baffle 3 through the second universal ball 407. As it continues to move along the second rack 406, since the push rod 402 cannot continue to rotate, the first rod body 4041 and the second rod body 4047 will overcome the second elastic limiting sleeve 4045 and rotate relative to each other, causing the first rod body to move downward 4041, driving the push rod 402 to descend and reset.

[0052] In this embodiment, it is not necessary for the first rack 405, the second rack 406 and the specifications of the frame 5 to be fixed to completely correspond to each other, and frames 5 of different specifications can be positioned and transported.

[0053] Example 5

[0054] As attached Figure 3 , Figure 4As shown, different from Example 4, in this embodiment, the top rod 402 is detachably connected to the first rod body 4041, which can be specifically a threaded connection, a slot is provided on the second rod body 4047, and a retaining ring 4046 is provided on the periphery of the second rod body 4047.

[0055] After removing the push rod 402 and the first rod body 4041, insert a wrench into the slot and rotate it to fix the second rod body 4047, so that the first rod body 4041 and the second rod body 4047 can overcome the relative rotation of the second elastic limiting sleeve 4045. The first rod body 4041 can be repaired and replaced to ensure the limiting effect of the second elastic limiting sleeve 4045. When installing the first rod body 4041, the installation position can be determined by the contact between the retaining ring 4046 and the second elastic limiting sleeve 4045.

[0056] Example 6

[0057] As attached Figure 3 , Figure 5 , Fig. 9 As shown, different from Example 1, in this embodiment, a second universal ball 407 is provided at the end of the push rod 402, and a fixing mechanism 6 is also included. The fixing mechanism 6 includes two third racks 603. The third racks 603 are arranged along the conveying direction and are slidably arranged on the support plate 201 along the conveying direction. A third universal ball (not shown) is provided at one end of the third rack 603. The two third racks 603 are respectively meshed and connected with a gear 409. Specifically, a slide groove 602 is provided on the support plate 201 along the conveying direction. A slide plate 601 is slidably provided in the slide groove 602, and the third rack 603 is arranged on the slide plate 601.

[0058] Working principle: During operation, in this embodiment, when the gear 409 rotates, the third rack 603 is driven to move, so that not only the front and rear reverse positioning of the frame 5 can be achieved through the top rod 402, but also the left and right positioning of the frame 5 can be achieved through the two third racks 603. The frame 5 can be accurately positioned through four universal balls, which can facilitate subsequent processing, and the four universal balls have little friction on the frame 5, and it is not easy to cause damage to the frame 5.

[0059] In addition, it should be noted that, in the present embodiment, the lengths of the first rack 405 and the second rack 406 need to be adapted to the specifications of the specific frame 5, that is, when the gear 409 has moved along the first rack 405, the distance between the ends of the two push rods 402 is equivalent to the distance between the two longitudinal beams 502 of the frame 5, and the top fixation is just completed. In order to prevent self-rotation, the second rack 406 and the first rack 405 need to be arranged uninterruptedly, that is, after the gear 409 has just moved along the first rack 405, it moves along the second rack 406. After completing the top fixation, processing, and removing the frame 5, the support mechanism 2 can be reset to the initial position.

[0060] However, based on the present embodiment, the structure of the rotating rod 404 includes a first rod body 4041 and a second rod body 4047 arranged above and below, the top rod 402 is arranged on the first rod body 4041, the top of the first rod body 4041 is provided with a threaded sleeve 4042 along the vertical direction, the second rod body 4047 is arranged to rotate relative to the connecting block 401, the top of the second rod body 4047 is provided with a threaded rod 4043 adapted to the threaded sleeve 4042 and is threadedly connected to the threaded sleeve 4042 through the threaded rod 4043, and the second rod body 404 047 and the first rod body 4041 is provided with a second elastic limiting sleeve 4045. Specifically, the second elastic limiting sleeve 4045 can be made of rubber, and is provided with a plurality of them, which are connected to the first rod body 4041 through a limiting spring 4044; a limiting baffle 3 for limiting the push rod 402 is provided between the two rotating rods 404 on the support plate 201; there is no need for the first rack 405, the second rack 406 and the specifications of the frame 5 to be fixed to completely correspond, and frames 5 of different specifications can be positioned and transmitted.

[0061] It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0062] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0063] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A conveying device for a patrol car frame production line, comprising a conveying mechanism (1) and a supporting mechanism (2) located on the conveying mechanism (1), wherein the supporting mechanism (2) moves with the conveying mechanism (1), characterized in that: The support mechanism (2) comprises a support plate (201) and a plurality of first universal balls (202) located on the support plate (201); The vehicle frame (5) also includes a positioning mechanism (4) for positioning the vehicle frame (5), the positioning mechanism (4) including a connecting block (401) connected to the transmission mechanism (1) and the support plate (201) respectively, the transmission mechanism (1) drives the support plate (201) to move through the connecting block (401), rotating rods (404) along the vertical direction are rotatably provided on both sides of the connecting block (401), the two rotating rods (404) are symmetrically arranged and rotate synchronously, the top of the rotating rod (404) passes through the support plate (201) and is provided with a top rod (402), the bottom of the rotating rod (404) is provided with a gear (409), the transmission mechanism (1) is provided with a first rack (405) and a second rack (406) adapted to the gear (409) along the transmission direction, the first rack (405) and the second rack (406) are along the transmission direction, and the first rack (405) and the second rack (406) are in opposite directions and are respectively located on both sides of the gear (409), During operation, the frame (5) is placed on the support plate (201). When the connecting block (401) drives the support plate (201) to move along the transmission direction, the two gears (409) are driven to move forward and reversely, and then the rotating rod (404) and the push rod (402) are driven to move forward and reversely in sequence. The frame (5) is first positioned and fixed by the two push rods (402) and then reset.

2. A conveying device for a patrol car frame production line according to claim 1, characterized in that: The connecting block (401) is provided with connecting plates (403) on both sides, and a rotating rod (404) is rotatably arranged through the connecting plate (403). The bottom of the rotating rod (404) passes through the connecting plate (403) and is rotatably connected to the connecting plate (403), and a first elastic limiting sleeve (408) is provided between the connecting plate (403).

3. A conveying device for a patrol car frame production line according to claim 1, characterized in that: The transmission mechanism (1) comprises a frame (101) and a magnetic coupling rodless cylinder (102) arranged on the frame (101), and the connection block (401) is respectively connected to a slider and a support plate (201) of the magnetic coupling rodless cylinder (102).

4. A conveying device for a patrol car frame production line according to claim 1, characterized in that: Two sets of the first rack (405) and the second rack (406) are provided, and each gear (409) is adapted to a first rack (405) and a second rack (406) respectively.

5. The conveying device for a patrol car frame production line according to claim 1, characterized in that: A second universal ball (407) is provided at the end of the top rod (402).

6. A conveying device for a patrol car frame production line according to claim 5, characterized in that: The rotating rod (404) comprises a first rod body (4041) and a second rod body (4047) which are arranged above and below each other. The top rod (402) is arranged on the first rod body (4041). A threaded sleeve (4042) is arranged at the top of the first rod body (4041) along the vertical direction. The second rod body (4047) is arranged to rotate relative to the connecting block (401). A threaded rod (4043) adapted to the threaded sleeve (4042) is arranged at the top of the second rod body (4047) and is threadedly connected to the threaded sleeve (4042) through the threaded rod (4043). A second elastic limiting sleeve (4045) is arranged between the second rod body (4047) and the first rod body (4041). A limiting baffle (3) for limiting the position of the top rod (402) is provided between the two rotating rods (404) on the support plate (201).

7. A conveying device for a patrol car frame production line according to claim 6, characterized in that: The second elastic limiting sleeve (4045) is connected to the first rod body (4041) via a limiting spring (4044).

8. A conveying device for a patrol car frame production line according to claim 6, characterized in that: The top rod (402) is detachably connected to the first rod body (4041), a slot is provided on the second rod body (4047), and a retaining ring (4046) is provided around the second rod body (4047).

9. A conveying device for a patrol car frame production line according to claim 5, characterized in that: It also includes a fixing mechanism (6), which includes two third racks (603). The third racks (603) are arranged along the conveying direction and are slidably arranged on the support plate (201) along the conveying direction. A third universal ball is arranged at one end of the third rack (603). The two third racks (603) are respectively meshed and connected with a gear (409).

10. A conveying device for a patrol car frame production line according to claim 9, characterized in that: The support plate (201) is provided with a slide groove (602) along the conveying direction, a slide plate (601) is slidably arranged in the slide groove (602), and the third rack (603) is arranged on the slide plate (601).

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